// This file is part of libigl, a simple c++ geometry processing library.
//
// Copyright (C) 2014 Daniele Panozzo <daniele.panozzo@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla Public License
// v. 2.0. If a copy of the MPL was not distributed with this file, You can
// obtain one at http://mozilla.org/MPL/2.0/.
#ifndef IGL_NROSY_H
#define IGL_NROSY_H

#include <iostream>
#include <Eigen/Core>
#include <Eigen/Sparse>
#include <vector>
#include <igl/igl_inline.h>

namespace igl
{
// Generate a N-RoSy field from a sparse set of constraints
//
// Inputs:
//   V       #V by 3 list of mesh vertex coordinates
//   F       #F by 3 list of mesh faces (must be triangles)
//   b       #B by 1 list of constrained face indices
//   bc      #B by 3 list of representative vectors for the constrained faces
//   b_soft  #S by 1 b for soft constraints
//   w_soft  #S by 1 weight for the soft constraints (0-1)
//   bc_soft #S by 3 bc for soft constraints
//   N       the degree of the N-RoSy vector field
//   soft    the strenght of the soft contraints w.r.t. smoothness
//           (0 -> smoothness only, 1->constraints only)

// Outputs:
//   R       #F by 3 the representative vectors of the interpolated field
//   S       #V by 1 the singularity index for each vertex (0 = regular)

IGL_INLINE void nrosy(
  const Eigen::MatrixXd& V,
  const Eigen::MatrixXi& F,
  const Eigen::VectorXi& b,
  const Eigen::MatrixXd& bc,
  const Eigen::VectorXi& b_soft,
  const Eigen::VectorXd& w_soft,
  const Eigen::MatrixXd& bc_soft,
  const int N,
  const double soft,
  Eigen::MatrixXd& R,
  Eigen::VectorXd& S
  );

//wrapper for the case without soft constraints
IGL_INLINE void nrosy(
 const Eigen::MatrixXd& V,
 const Eigen::MatrixXi& F,
 const Eigen::VectorXi& b,
 const Eigen::MatrixXd& bc,
 const int N,
 Eigen::MatrixXd& R,
 Eigen::VectorXd& S
  );

}

#ifndef IGL_STATIC_LIBRARY
#  include "nrosy.cpp"
#endif

#endif
